CN111628655B - Transient direct current bias universal phase shift control method for double-active bridge direct current converter - Google Patents
Transient direct current bias universal phase shift control method for double-active bridge direct current converter Download PDFInfo
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- 230000010363 phase shift Effects 0.000 title claims abstract description 85
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- 238000000034 method Methods 0.000 title claims abstract description 58
- 230000008569 process Effects 0.000 claims description 26
- 230000007704 transition Effects 0.000 claims description 24
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- 230000009977 dual effect Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a general phase shift control method for transient direct current bias of a double-active-bridge direct current converter, which is characterized in that single phase shift and double phase shift can be regarded as special conditions of triple phase shift, so that the invention mainly analyzes from the angle of triple phase shift. The method comprises, during steady state, the primary and secondary full-bridge output sides in the double active bridge DC converter are respectively designated as V AB ，V CD . The internal phase shift duty ratio of the primary side is D1, the external phase shift duty ratio of the primary side and the secondary side is D2, and the internal phase shift duty ratio of the secondary side is D 3 . Assuming that the phase shift duty ratio is suddenly changed from D1, D2 and D3 in a steady state to D1', D2', D3 'in a next steady state, and in a transient state, the on-off time of a switching tube in a first switching period after the sudden change of the adjustment duty ratio meets a certain relation, after the second switching period after abrupt change, the phase-shifting duty cycle is stabilized to be D1', D2', D3', and then the transient DC bias of the converter can be eliminated. The invention can reduce the current impact in transient state and quicken the dynamic response.
Description
Technical Field
The invention belongs to the technical field of power electronics, relates to a double-active-bridge direct-current converter, and particularly relates to a transient direct-current bias universal phase-shift control method for the double-active-bridge direct-current converter and application thereof.
Background
The double-active-bridge direct-current converter has the advantages of simple topological structure, bidirectional energy flow, easy realization of soft switching and the like, and has good application prospects in occasions such as energy storage systems, electric automobile charging piles and the like. However, due to abrupt change of phase-shifting duty ratio, difference of device parameters and the like, transient bias current can occur in a high-frequency transformer and an inductor of the double-active-bridge direct-current converter. Transient bias currents cause increased current stress, increased losses, and reduced converter efficiency. If bias current exists for a long time, saturation of the magnetic element can be caused, and circuit damage is finally caused.
In research, it is generally believed that the voltage across the transformer satisfies the volt-second balance during one switching cycle. In a steady state process, the double active bridge DC converter can meet the conditions, and the current of the transformer does not generate DC bias. However, at the moment when the phase-shifting duty ratio changes, the voltages at the two ends of the transformer do not meet the balance of volt-seconds, so that the transient DC bias phenomenon is generated.
The traditional method of suppressing the bias current is to series-connect a blocking capacitor, but this can significantly increase the volume and cost of the converter. When the converter operates at rated power, rated current also flows through the blocking capacitor, resulting in reduced efficiency.
Chinese patent "inventor: zhang Bocheng, zhang Junming, shao Shuai, wu Xinke. Application number: 201910366347.0, "a method for suppressing bias current of a magnetic element of a double-active-bridge converter" refers to adding a steady-state current controller to suppress direct-current bias, but filtering to obtain a current average value to control the phase-shifting duty ratio of a switching tube, so that the response speed is slow, and the transient direct-current bias suppression capability is limited when the phase-shifting duty ratio is suddenly changed, which may cause saturation of the magnetic element to jeopardize the safe operation of a circuit.
Chinese patent application number: aiming at single phase shift control, CN201410678003.0 'a transient phase shift control method for a double-active full-bridge direct current converter' proposes that the transient bias is eliminated by adjusting the on-off moment of a switching tube in the first period after the phase shift duty ratio is suddenly changed, and the method has higher response speed, but the realization method is only suitable for a strategy that the phase shift duty ratio exists between the primary side and the secondary side and is single phase shift modulation, and the transient direct current bias inhibition capability cannot be realized in the double-phase shift or triple phase shift modulation strategy.
Disclosure of Invention
The invention aims to solve the problems and provides a general phase shift control method and application for transient direct current bias of a double-active-bridge direct current converter. And an auxiliary device is not adopted, and transient direct current bias caused by the abrupt change of the phase shift duty ratio of the double-active bridge direct current converter is eliminated through a control means, so that current stress in transient state is reduced, and dynamic response is accelerated. The algorithm has good universality and can be applied to Single Phase Shift (SPS), double Phase Shift (DPS) or Triple Phase Shift (TPS), so that the current stress of the system is effectively reduced.
The technical means adopted by the invention are as follows:
a transient direct current bias general phase shift control method for a double active bridge direct current converter comprises the following steps:
(1) The driving pulses (S1, S2, S3, S4, S5, S6, S7 and S8) of the eight switching tubes on the primary side and the secondary side in the double-active-bridge direct-current converter are square waves with the duty ratio of 50% when the converter runs stably;
(2) The driving pulse (S1) of the switching tube 1 and the driving pulse (S2) of the switching tube 2 of the primary full-bridge converter H1 are set to be complementary, and the driving pulse (S3) of the switching tube 3 and the driving pulse (S4) of the switching tube 4 are set to be complementary; the driving pulse (S5) of the switching tube 5 and the driving pulse (S6) of the switching tube 6 of the secondary full-bridge converter H2 are complementary, and the driving pulse (S7) of the switching tube 7 and the driving pulse (S8) of the switching tube 8 are complementary;
(3) A phase shift duty ratio D1 is arranged between a driving pulse (S1) of a switching tube 1 and a driving pulse (S4) of a switching tube 4 of the primary full-bridge converter H1;
(4) A phase shift duty ratio D2 is arranged between a driving pulse (S1) of a switching tube 1 of the primary full-bridge converter H1 and a driving pulse (S5) of a switching tube 5 of the secondary full-bridge converter H2;
(5) A phase shift duty ratio D3 is arranged between the driving pulse (S5) of the switching tube 5 and the driving pulse (S8) of the switching tube 8 of the secondary full-bridge converter H2;
(6) The phase shift duty ratios D1, D2 and D3 control the magnitude and the direction of the transmission power of the converter;
(7) According to whether D2+D3 is greater than or equal to 1, the stable working state of triple phase shifting can be divided into two modes, and if D2+D3<1, the converter is considered to be in mode 1; if D2+D3 is greater than or equal to 1, then the converter is considered to be in mode 2;
(8) The steady state before the phase shift duty ratio mutation is named as a first steady state, the steady state after the phase shift duty ratio mutation is named as a second steady state, and the transient transition process is named between the first steady state and the second steady state;
(9) Setting the opening time of S4 as X1 and the closing time as X2 in the transient transition process; the switching-on time of S5 is Y1 Ts, and the switching-off time is Y2 Ts; the on time of S8 is Z1 and the off time is Z2.
(10) Since the steady operation state of the converter is divided into two modes, the duty cycle is changed from D1, D2, D3 in the first steady state to D1", D2", D3 "in the second steady state, and the changes in the system mode or between modes are divided into four types: the first steady state is mode 1, and the second steady state is mode 1; the first steady state is mode 1, and the second steady state is mode 2; the first steady state is mode 2, and the second steady state is mode 1; the first steady state is mode 2 and the second steady state is mode 2.
(11) Let d1' =0.5 (d1+d1 "), d2' =0.5 (d2+d2"), d3' =0.5 (d3+d3 ");
(12) If the first steady state is mode 1 and the second steady state is mode 1, let x1=d1', x2=1+d1″ of the transient transition process; y1=d2', y2=1+d2 "; z1=d2 '+d3', z2=d2 "+d3" +1, then the transient dc bias in this case can be eliminated;
(13) If the first steady state is mode 1 and the second steady state is mode 2, let x1=d1', x2=1+d1″ of the transient transition process; y1=d2', y2=1+d2 "; z1=d2 '+d3', z2=d2 "+d3" -1, then the transient dc bias in this case can be eliminated;
(14) If the first steady state is mode 2 and the second steady state is mode 1, let x1=d1', x2=1+d1″ of the transient transition process; y1=d2', y2=1+d2 "; z1=d2 "+d3", z2=d2 '+d3', then the transient dc bias in this case can be eliminated;
(15) If the first steady state is mode 2 and the second steady state is mode 2, let x1=d1', x2=1+d1″ of the transient transition process; y1=d2', y2=1+d2 "; z1=d2 "+d3", z2=d2 '+d3' -1, then the transient dc bias in this case can be eliminated.
Furthermore, the phase shift duty ratios D1, D2, and D3 are all greater than or equal to 0 and less than or equal to 1.
Furthermore, the phase shift duty ratios D1", D2", D3 "are all greater than or equal to 0 and less than or equal to 1.
Furthermore, the method is not only suitable for the topology with the full-bridge structure of the primary side and the secondary side, but also suitable for the topology with the half-bridge three-level structure of one side of the primary side and the secondary side, the full-bridge structure of one side, and the half-bridge three-level structure of the primary side and the secondary side.
By adopting the technical scheme, the invention has the beneficial effects that:
when the phase shift duty ratio of the double-active bridge direct current converter is suddenly changed from the first stable state, the inductor current reaches the second stable state in one switching period by adjusting the switching-on and switching-off time of the switching tube in the transient process, so that transient direct current bias is eliminated, current impact in transient is reduced, and dynamic response is accelerated. The invention is also applicable to single phase shift and double phase shift as a phase shift control method for processing the triple phase shift transient bias, and is a general phase shift control method for processing the transient direct current bias.
Drawings
FIG. 1 is a topological structure diagram of a full bridge for both primary and secondary sides of a dual active bridge DC converter controlled by the present invention;
FIG. 2 is a topological structure diagram of a half-bridge three-level topology of primary and secondary sides of a double-active-bridge DC converter controlled by the invention;
FIG. 3a is a schematic diagram of mode 1 in the mode classification of the dual active bridge DC converter triple phase shift control according to the present invention;
FIG. 3b is a schematic diagram of mode 2 in the mode classification of the dual active bridge DC converter triple phase shift control according to the present invention;
FIG. 4a is a schematic diagram of a transient phase shift control method for a dual-active bridge DC converter according to the present invention under triple phase shift in the above-described mode classification, wherein the first steady state is mode 1 and the second steady state is mode 1;
FIG. 4b is a schematic diagram of a transient phase shift control method for a dual-active-bridge DC converter under triple phase shifting in the above-described mode classification, wherein the first steady state is mode 1 and the second steady state is mode 2;
FIG. 4c is a schematic diagram of a transient phase shift control method for a dual-active bridge DC converter according to the present invention under triple phase shift in the above-described mode classification, wherein the first steady state is mode 2 and the second steady state is mode 1;
fig. 4d is a schematic diagram of a transient phase shift control method for a dual-active bridge dc converter under triple phase shift in the above-mentioned mode classification, when the first steady state is mode 2 and the second steady state is mode 2.
Detailed Description
The invention disclosesThe invention discloses a general phase shift control method for transient direct current bias of a double-active-bridge direct current converter, and the single phase shift and the double phase shift can be regarded as special cases of triple phase shift, so the invention mainly analyzes from the triple phase shift angle. The method comprises, during steady state, the primary and secondary full-bridge output sides in the double active bridge DC converter are respectively designated as V AB ，V CD . The internal phase shift duty ratio of the primary side is D1, the external phase shift duty ratio of the primary side and the secondary side is D2, and the internal phase shift duty ratio of the secondary side is D 3 . Assuming that the phase shift duty ratio is suddenly changed from D1, D2 and D3 in a steady state to D1', D2', D3 'in a next steady state, and in a transient state, the on-off time of a switching tube in a first switching period after the sudden change of the adjustment duty ratio meets a certain relation, after the second switching period after abrupt change, the phase-shifting duty cycle is stabilized to be D1', D2', D3', and then the transient DC bias of the converter can be eliminated. The invention can reduce the current impact in transient state and quicken the dynamic response.
Specifically, the method for controlling transient direct current bias universal phase shift of the double-active bridge direct current converter comprises the following steps:
(1) The driving pulses (S1, S2, S3, S4, S5, S6, S7 and S8) of the eight switching tubes on the primary side and the secondary side in the double-active-bridge direct-current converter are square waves with the duty ratio of 50% when the converter runs stably;
(2) The driving pulse (S1) of the switching tube 1 and the driving pulse (S2) of the switching tube 2 of the primary full-bridge converter H1 are set to be complementary, and the driving pulse (S3) of the switching tube 3 and the driving pulse (S4) of the switching tube 4 are set to be complementary; the driving pulse (S5) of the switching tube 5 and the driving pulse (S6) of the switching tube 6 of the secondary full-bridge converter H2 are complementary, and the driving pulse (S7) of the switching tube 7 and the driving pulse (S8) of the switching tube 8 are complementary;
(3) A phase shift duty ratio D1 is arranged between a driving pulse (S1) of a switching tube 1 and a driving pulse (S4) of a switching tube 4 of the primary full-bridge converter H1;
(4) A phase shift duty ratio D2 is arranged between a driving pulse (S1) of a switching tube 1 of the primary full-bridge converter H1 and a driving pulse (S5) of a switching tube 5 of the secondary full-bridge converter H2;
(5) A phase shift duty ratio D3 is arranged between the driving pulse (S5) of the switching tube 5 and the driving pulse (S8) of the switching tube 8 of the secondary full-bridge converter H2;
(6) The phase shift duty ratios D1, D2 and D3 control the magnitude and the direction of the transmission power of the converter;
(7) According to whether D2+D3 is more than or equal to 1, dividing the stable working state of triple phase shifting into two modes, and if D2+D3 is less than 1, considering that the converter is in the mode 1; if D2+D3 is greater than or equal to 1, then the converter is considered to be in mode 2;
(8) The steady state before the phase shift duty ratio mutation is named as a first steady state, the steady state after the phase shift duty ratio mutation is named as a second steady state, and the transient transition process is named between the first steady state and the second steady state;
(9) Setting the opening time of S4 as X1 and the closing time as X2 in the transient transition process; the switching-on time of S5 is Y1 Ts, and the switching-off time is Y2 Ts; the switching-on time of S8 is Z1 Ts, and the switching-off time is Z2 Ts;
(10) Since the steady operation state of the converter is divided into two modes, the duty cycle is changed from D1, D2, D3 in the first steady state to D1", D2", D3 "in the second steady state, and the changes in the system mode or between modes are divided into four types: the first steady state is mode 1, and the second steady state is mode 1; the first steady state is mode 1, and the second steady state is mode 2; the first steady state is mode 2, and the second steady state is mode 1; the first steady state is mode 2, and the second steady state is mode 2;
(11) Let d1' =0.5 (d1+d1 "), d2' =0.5 (d2+d2"), d3' =0.5 (d3+d3 ");
(12) If the first steady state is mode 1 and the second steady state is mode 1, let x1=d1', x2=1+d1″ of the transient transition process; y1=d2', y2=1+d2 "; z1=d2 '+d3', z2=d2 "+d3" +1, then the transient dc bias in this case can be eliminated;
(13) If the first steady state is mode 1 and the second steady state is mode 2, let x1=d1', x2=1+d1″ of the transient transition process; y1=d2', y2=1+d2 "; z1=d2 '+d3', z2=d2 "+d3" -1, then the transient dc bias in this case can be eliminated;
(14) If the first steady state is mode 2 and the second steady state is mode 1, let x1=d1', x2=1+d1″ of the transient transition process; y1=d2', y2=1+d2 "; z1=d2 "+d3", z2=d2 '+d3', then the transient dc bias in this case can be eliminated;
(15) If the first steady state is mode 2 and the second steady state is mode 2, let x1=d1', x2=1+d1″ of the transient transition process; y1=d2', y2=1+d2 "; z1=d2 "+d3", z2=d2 '+d3' -1, then the transient dc bias in this case can be eliminated.
Furthermore, the phase shift duty ratios D1 and D2 are both more than or equal to 0, and D3 is less than or equal to 1.
Furthermore, the phase shift duty ratios D1 and D2 'are all more than or equal to 0, and D3' is less than or equal to 1.
Still further, the method for controlling transient direct current bias universal phase shift of the double-active-bridge direct current converter is used for topology with full-bridge structure of primary and secondary sides; one side of the primary side and the secondary side is of a half-bridge three-level structure, and the other side is of a full-bridge structure; the primary side and the secondary side are both the topology of a half-bridge three-level structure.
Referring to fig. 1, in the embodiment, a switching tube 1, a switching tube 2, a switching tube 3, a switching tube 4, a switching tube 5, a switching tube 6, a switching tube 7, and a switching tube 8 are switching tubes at corresponding positions S1, S2, S3, S4, S5, S6, S7, and S8, respectively. In practice, the method of the invention is applicable to the complementation of the driving pulses of the switching tubes corresponding to each other in a half-bridge or full-bridge structure.
Specific embodiments of the invention will be described in detail below with reference to the technical solutions of the invention and the accompanying drawings, and it should be noted that the described embodiments are intended to facilitate understanding of the invention without any limitation.
Fig. 1 shows a topology structure of a full bridge for a primary side and a secondary side of a dual-active bridge dc converter in an application of the present invention, where the topology structure mainly includes full bridge converters H1 and H2, filter capacitors C1 and C2, a magnetic element inductance L, and a high-frequency isolation transformer TF.
Fig. 2 shows a topology structure of half-bridge three-level on primary and secondary sides of a dual-active-bridge direct-current converter in the application occasion of the invention, wherein the topology structure mainly comprises half-bridge three-level converters H1 and H2, primary side and lower bus capacitors C1 and C2, secondary side and lower bus capacitors C4 and C5, a magnetic element inductance L and a high-frequency isolation transformer TF.
The triple phase shift of the double-active-bridge direct current converter can be divided into two modes according to whether D2+D3 is greater than or equal to 1, if the D2+D3 is satisfied<1, then consider to be in mode 1, as shown in fig. 3 a; if D2+D3 is satisfied ≡1, then it is considered to be in mode 2 as shown in FIG. 3 b. V (V) AB Is the voltage difference between the A point and the B point, V CD The voltage difference between the C point and the D point is IL, the inductive current, and Ths, the half of the switching period.
In the steady state, when the dual-active bridge dc converter is in the mode 1, the time corresponding to the rising edge of S1 is 0 x thes, the time corresponding to the falling edge is 1 x thes, the time corresponding to the rising edge of S4 is D1 x thes, the time corresponding to the falling edge is (1+d1) x thes, the time corresponding to the rising edge of S5 is D2 x thes, the time corresponding to the falling edge is (1+d2) x thes, the time corresponding to the rising edge of S8 is (d2+d3) x thes, and the time corresponding to the falling edge is (d2+d3+1) x thes.
In the steady state, when the dual-active bridge dc converter is in the mode 2, the timings corresponding to the rising edges and the falling edges of S1, S4, and S5 are the same as the mode 1, but the timing corresponding to the rising edge of S8 is (d2+d3) ×ths, and the timing corresponding to the falling edge is (d2+d3-1) ×ths.
The scheme of the invention for transient phase shift control of the triple phase shift of the double active bridge DC converter is shown in figure 4. Since the triple phase shift control modes are divided into two types, the first steady state is discussed as mode 1, and the second steady state is discussed as mode 1; the first steady state is mode 1, and the second steady state is mode 2; the first steady state is mode 2, and the second steady state is mode 1; the first steady state is mode 2 and the second steady state is mode 2, as shown in fig. 4a, 4b, 4c, 4d, respectively. Before the time t0 'in fig. 4a, 4b, 4c and 4D, the double-active bridge is operated in a steady state with phase-shifting duty cycles D1, D2 and D3, and after the time t0 "the double-active bridge dc converter is operated in a steady state with phase-shifting duty cycles D1", D2 "and D3", t0' to t0 "is a complete switching cycle of the transient transition process.
Setting the opening time of S4 as X1 and the closing time as X2 in the transient transition process; the switching-on time of S5 is Y1 Ts, and the switching-off time is Y2 Ts; the on time of S8 is Z1 and the off time is Z2.
Let d1' =0.5 (d1+d1 "), d2' =0.5 (d2+d2"), d3' =0.5 (d3+d3 ").
If the first steady state is mode 1 and the second steady state is mode 1, let x1=d1', x2=1+d1″ of the transient transition process; y1=d2', y2=1+d2 "; z1=d2 '+d3', z2=d2 "+d3" +1, then the transient dc bias in this case can be eliminated.
If the first steady state is mode 1 and the second steady state is mode 2, let x1=d1', x2=1+d1″ of the transient transition process; y1=d2', y2=1+d2 "; z1=d2 '+d3', z2=d2 "+d3" -1, then the transient dc bias in this case can be eliminated.
If the first steady state is mode 2 and the second steady state is mode 1, let x1=d1', x2=1+d1″ of the transient transition process; y1=d2', y2=1+d2 "; z1=d2 "+d3", z2=d2 '+d3', then the transient dc bias in this case can be eliminated.
If the first steady state is mode 2 and the second steady state is mode 2, let x1=d1', x2=1+d1″ of the transient transition process; y1=d2', y2=1+d2 "; z1=d2 "+d3", z2=d2 '+d3' -1, then the transient dc bias in this case can be eliminated.
As can be seen from the figure, the single phase shift can make d1=d1 "=0, d3=d3" =0 in the above discussion, that is, S1 and S4 are turned on and off simultaneously, S5 and S8 are turned on and off simultaneously, and the transient bias can be eliminated by processing in the same manner.
As can be seen from the figure, the double phase shift can eliminate the transient bias by treating d1=d3, D1 "=d3" in the above discussion in the same way.
Under the traditional phase-shifting control method, the abrupt change of the phase-shifting duty ratio can cause great current impact, so that the transformer generates direct current bias, and meanwhile, the maximum value of the current is increased, thereby jeopardizing the safe operation of the switching device. Under the general phase-shifting control method for transient direct current bias of the double-active-bridge direct current converter, when the phase-shifting duty ratio is suddenly changed, the transient bias is eliminated, the current impact is reduced, and the current is balanced in one switching period.
Claims (4)
1. A transient direct current bias general phase shift control method for a double active bridge direct current converter is characterized in that: the control method comprises the following steps:
(1) The driving pulses (S1, S2, S3, S4, S5, S6, S7 and S8) of the eight switching tubes on the primary side and the secondary side in the double-active-bridge direct-current converter are square waves with the duty ratio of 50% when the converter runs stably;
(2) The driving pulse (S1) of the switching tube 1 and the driving pulse (S2) of the switching tube 2 of the primary full-bridge converter H1 are set to be complementary, and the driving pulse (S3) of the switching tube 3 and the driving pulse (S4) of the switching tube 4 are set to be complementary; the driving pulse (S5) of the switching tube 5 and the driving pulse (S6) of the switching tube 6 of the secondary full-bridge converter H2 are complementary, and the driving pulse (S7) of the switching tube 7 and the driving pulse (S8) of the switching tube 8 are complementary;
(3) A phase shift duty ratio D1 is arranged between a driving pulse (S1) of a switching tube 1 and a driving pulse (S4) of a switching tube 4 of the primary full-bridge converter H1;
(4) A phase shift duty ratio D2 is arranged between a driving pulse (S1) of a switching tube 1 of the primary full-bridge converter H1 and a driving pulse (S5) of a switching tube 5 of the secondary full-bridge converter H2;
(5) A phase shift duty ratio D3 is arranged between the driving pulse (S5) of the switching tube 5 and the driving pulse (S8) of the switching tube 8 of the secondary full-bridge converter H2;
(6) The phase shift duty ratios D1, D2 and D3 control the magnitude and the direction of the transmission power of the converter;
(7) According to whether D2+D3 is more than or equal to 1, dividing the stable working state of triple phase shifting into two modes, and if D2+D3 is less than 1, considering that the converter is in the mode 1; if D2+D3 is greater than or equal to 1, then the converter is considered to be in mode 2;
(8) The steady state before the phase shift duty ratio mutation is named as a first steady state, the steady state after the phase shift duty ratio mutation is named as a second steady state, and the transient transition process is named between the first steady state and the second steady state;
(9) Setting the opening time of S4 as X1 and the closing time as X2 in the transient transition process; the switching-on time of S5 is Y1 Ts, and the switching-off time is Y2 Ts; the switching-on time of S8 is Z1 Ts, and the switching-off time is Z2 Ts;
(10) Since the steady operation state of the converter is divided into two modes, the duty cycle is changed from D1, D2, D3 in the first steady state to D1", D2", D3 "in the second steady state, and the changes in the system mode or between modes are divided into four types: the first steady state is mode 1, and the second steady state is mode 1; the first steady state is mode 1, and the second steady state is mode 2; the first steady state is mode 2, and the second steady state is mode 1; the first steady state is mode 2, and the second steady state is mode 2;
(11) Let d1' =0.5 (d1+d1 "), d2' =0.5 (d2+d2"), d3' =0.5 (d3+d3 ");
(12) If the first steady state is mode 1 and the second steady state is mode 1, let x1=d1', x2=1+d1″ of the transient transition process; y1=d2', y2=1+d2 "; z1=d2 '+d3', z2=d2 "+d3" +1, then the transient dc bias in this case can be eliminated;
(13) If the first steady state is mode 1 and the second steady state is mode 2, let x1=d1', x2=1+d1″ of the transient transition process; y1=d2', y2=1+d2 "; z1=d2 '+d3', z2=d2 "+d3" -1, then the transient dc bias in this case can be eliminated;
(14) If the first steady state is mode 2 and the second steady state is mode 1, let x1=d1', x2=1+d1″ of the transient transition process; y1=d2', y2=1+d2 "; z1=d2 "+d3", z2=d2 '+d3', then the transient dc bias in this case can be eliminated;
(15) If the first steady state is mode 2 and the second steady state is mode 2, let x1=d1', x2=1+d1″ of the transient transition process; y1=d2', y2=1+d2 "; z1=d2 "+d3", z2=d2 '+d3' -1, then the transient dc bias in this case can be eliminated.
2. The method for controlling transient direct current bias universal phase shift of double active bridge direct current converter as claimed in claim 1, wherein said phase shift duty ratio D1, D2 is not less than 0 and D3 is not less than 1.
3. The method for controlling transient direct current bias universal phase shift of a double-active-bridge direct current converter according to claim 1, wherein the phase shift duty ratios D1 and D2 are all equal to or more than 0, and D3 is equal to or less than 1.
4. The application of the universal phase shift control method for transient dc bias of the double-active-bridge dc converter according to any one of claims 1 to 3, wherein the universal phase shift control method for transient dc bias of the double-active-bridge dc converter according to claims 1 to 3 is used for a topology with full-bridge structure of primary and secondary sides; one side of the primary side and the secondary side is of a half-bridge three-level structure, and the other side is of a full-bridge structure; the primary side and the secondary side are both the topology of a half-bridge three-level structure.
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| CN112260551B (en) * | 2020-10-30 | 2021-08-24 | 西南交通大学 | Control method and device of double-active-bridge DC-DC converter without direct current bias |
| CN112615549B (en) * | 2020-12-22 | 2021-12-17 | 上海科技大学 | Novel universal four-phase shift modulation method for improving dynamic performance of double active bridges |
| CN113394984B (en) * | 2021-07-02 | 2022-03-22 | 山东大学 | Full-working-condition current stress optimization control method for hybrid three-level DAB converter |
| CN114285052B (en) * | 2022-01-21 | 2023-08-25 | 华中科技大学 | Transient process control method and system for double-active-bridge series resonant converter |
| CN115333374B (en) * | 2022-08-15 | 2023-06-02 | 西南交通大学 | Current type discrete phase shift control device and method for double-active-bridge DC-DC converter |
| CN116155115B (en) * | 2023-04-20 | 2023-07-21 | 西安奇点能源股份有限公司 | Transient direct current magnetic bias suppression method and system for double-active full-bridge bidirectional DC/DC converter |
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